Free Virus Scan for Windows

Run a free virus scan to check Windows for malware, suspicious files, spyware, browser threats, and other signs of infection.

Start a free virus scan and review what is really happening on your PC:

Start Free Virus Scan How to Run a Virus Scan

Signs You Need a Full Virus Scan

Use a free virus scan when the whole PC feels compromised and you want a broad malware check, not just a trojan-specific investigation.
Adware

Unwanted Pop-up Ads

You see frequent pop-ups, even when you're not browsing the web. Ads appear on your desktop or in applications.

Performance

Slow Computer

Your PC takes forever to boot up or run programs. Viruses consume system resources, slowing everything down.

Crashes

Frequent Freezes & Crashes

Applications freeze unexpectedly or the system crashes with the "blue screen of death" (BSOD).

Storage

Disappearing Disk Space

Your hard drive fills up unexpectedly. Viruses can replicate files and consume storage rapidly.

Network

Unusual Network Activity

Your internet connection is slow or you notice high data usage. Viruses often communicate with remote servers.

Security

Disabled Antivirus

Your security software is turned off and you can't re-enable it. Viruses often target antivirus programs first.

Virus Scanner
Virus Scanner Use a broad malware check when the exact threat is still unclear

Run a free virus scan on Windows before the problem gets harder to trace

Use Loaris when you need a free virus scan for Windows that checks suspicious files, browser changes, startup traces, and malware symptoms in one on-demand workflow.

Download Virus Scanner

How to run a free virus scan on Windows

This page is for users who want a broad malware check on Windows before deciding what kind of infection they are dealing with.

1. Start the Windows virus scan

Download Loaris and run the first scan when you see pop-ups, slowdowns, redirects, suspicious files, disabled security tools, or other signs that the PC may be infected.

2. Review malware findings and suspicious traces

Check the scan results for suspicious files, startup entries, browser abuse, spyware-style traces, and other indicators that explain why the system behaves abnormally.

3. Remove threats and rerun the scan

After cleanup, run one more virus scan to confirm that the PC no longer shows the same malware symptoms or suspicious activity.

How to run a free virus scan on Windows

Choose the right Windows scan path

Use the broader Virus Scan when the symptoms are real but the exact threat is still unclear. Use Trojan Scanner for suspicious installers and backdoors, or Free Antivirus when you want a second-opinion scan alongside Defender or another suite.

Trojan Scanner for Windows

Open Trojan Scanner for Windows when the problem looks more like a fake installer, downloader, credential stealer, or remote-access trojan.

Don't take our word for it

"We use Loaris on all of our company computers. Our experience is that Loaris is effective and trouble free."
- Robin G., Fort Worth, TX
"Loaris provides an extra, invaluable layer protection against malicious data, and that makes me and our systems feel safer!"
- Billy H., Sarasota, FL
"Eliminating hundreds of potential malware and trackers every week for our entire organization."

Virus Scanner FAQ

What is a free virus scan?
A free virus scan is an on-demand check that looks for malware, suspicious files, spyware-style behavior, browser abuse, and other common signs of infection on a Windows PC.
How do I run a virus scan on Windows?
Download Loaris, launch the app, run the first virus scan, review the detections, and then rerun a clean verification pass after removal. This helps confirm whether the Windows device still shows signs of malware.
Can I use Loaris as a free virus scanner?
Yes. Loaris gives you a free virus scan so you can inspect the PC, review suspicious findings, and decide whether you need a deeper cleanup or remediation step.
Is Free Virus Scan a different product from Loaris Trojan Remover?
No. Loaris Trojan Remover is the product you download. This page uses “Free Virus Scan” because many users search for a broad virus or malware check first. The same Loaris app helps you scan Windows, review suspicious items, and remove threats.

Need help? If the issue looks more like a backdoor or suspicious installer, open Trojan Scanner for Windows. If you want a second-opinion antivirus scan, open Free Antivirus Check for Windows. You can also review the Virus Scan Guide or visit the FAQ.